what mass of water should be added to 22.0 g of kcl to make a 5.50y mass solution? practice show your work.

Answer:

1.3244 x 10⁴⁹ atoms of zinc

Explanation:

2.20 x 10²⁵ moles

To convert from moles to atoms, we multiply by Avogadro's Number, 6.02 x 10²³

2.20 x 10²⁵ • 6.02 x 10²³

= 1.3244 x 10⁴⁹ atoms of zinc

Hope this helps!

Answer:

c

Explanation:

A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.

A chemical reaction is one in which  two or more reactants will react to form a new substance. When new substance will form it will produce heat. Therefore, when science teacher was mixing two liquids it was generating heat.

Heating a substance allow molecules to move faster. When heat is given to the object it will move fast. When heat will apply to a solid it will turn into liquid. When heat is supplied to the liquid it will turn into gas.

Therefore, A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

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In a collection of marbles, 25% of the marbles have a mass of 5.00 g and 75% of the marbles have a mass of 7.00 g. The average mass of a marble is 6.50 g.

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Answer → Source Noble Gases have a full valence shell, which is why they rarely form bonds with other atoms.

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Answer:

im not 2100][dskcmaln,NMCS KHJBXsjk[pl,;maxkcjxnxxxxxxxxxxxxxas'j

Explanation:

mnkc

Answer:

for question a element A and B are isobars

for question b element C and D have the same atomic numbers.

Explanation:

Answer: d. Water is the most abundant atom in Earth’s atmosphere.

Explanation:

Water percentage in the atmosphere is 0.001 percent only as it not the major reservoir or source of water. The water is available in the atmosphere in the form of water vapors. These water vapors when aggregate and their concentration becomes high they fall down as rain on earth so the rain is collected in water reservoirs like oceans, rivers, lakes, ponds, aquifers, and other sources of water, which are the components of hydrosphere on earth. So, hydrosphere is most abundant in water. Moreover, water is not an atom instead it is the molecule formed by the combination of two molecules of hydrogen and one molecule of oxygen.

Answer: m=Q/c*\Delta TQ/c∗ΔT = 1450cal/(0.11cal/g* 19.7ºC)=669.12 g1450cal/(0.11cal/g∗19.7ºC)=669.12g

Answer: 669.12g iron.

Explanation:

The given redox reaction can be represented in the following way: MnO₂ → MnO⁴⁻ + Ag → Ag+

To balance the redox reaction, the following steps are to be followed:

1: First, balance the net ionic equation with the help of half-reactions:

MnO2 → MnO⁴⁻+ e- [Oxidation Half-Reaction]

Ag+ + e- → Ag [Reduction Half-Reaction]

2: Determine the number of electrons that are required to balance the half-reactions. The oxidation half-reaction requires five electrons.

MnO₂ → MnO⁴⁻+ 5e-

The reduction half-reaction requires one electron.

Ag+ + e- → Ag

3: Find the least common multiple of the electrons required in the half-reactions, and use it to balance the equation. The least common multiple of 5 and 1 is 5. To balance the equation, multiply the oxidation half-reaction by 1 and the reduction half-reaction by 5. This will give us the following balanced equation:

5MnO₂ + 16H₂O + Ag → 5MnO⁴⁻ + 8OH- + 4Ag+

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Answer:

plz I. need a brainliest

Explanation:

I hope you have a good day

Answer:

It is proved that sin20=2sin0.cos0

Explanation:

Given

[tex]0=30[/tex] °

[tex]sin20=2sin0.cos0[/tex]

Substituting the value of "0" on both the sides, we get -

[tex]sin2 (30) =2sin 30 * cos 30\\sin 60 = 2 * sin 30 * cos 30 \\0.866 = 2 * 0.5 * 0.866\\0.866 = 0.866[/tex]

Since LHS = RHS

we can say that [tex]sin20=2sin0.cos0[/tex]

Answer:

See explanation

Explanation:

Usually, when we write a chemical formula for any compound or other chemical specie, we use subscripts to;

Hence, the subscripts written after chemical formulas have more than one function as described above.

In H2SO4 for instance, there are two hydrogen atoms, one sulphur atom and four oxygen atoms as shown in the chemical formula.

Answer: a

Explanation:

The highest entropy will be 0 mL of water at 100°C.

Entropy is just a measured physical quality that will be most usually linked with disorder, unpredictability, or uncertainty.

The quantity of random movement in a system increases as more energy is put into it. Entropy rises like a volume increases in a system.

Therefore, the correct answer will be option 1.

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Answer:

1.31M

Explanation:

Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:

Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:

15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂

Volume in Liters:

175mL * (1L / 1000mL) = 0.175L

The molarity is:

0.23moles / 0.175L

The value of an investment at the end of a specific time period is the Future value.

Future value is defined as the value of an asset or investment at a specific date in the future. It is calculated based on the present value of the investment, the interest rate, and the number of time periods. It is an important concept in finance as it recognizes the time value of money.

The time value of money recognizes that money today is worth more than the same amount of money in the future because of its earning potential. In other words, a dollar today is worth more than a dollar tomorrow because you can invest it and earn interest.

Future value takes into account the effects of compounding interest, which means that interest earned on an investment is added to the principal, and interest is earned on the new total.

On the other hand, NPV, ARR, net cash flows, and payback period are other important concepts in finance, but they do not explicitly recognize the time value of money. Net Present Value (NPV) is the difference between the present value of cash inflows and the present value of cash outflows.

ARR stands for Accounting Rate of Return, which is the average annual income from an investment over its life. Net cash flows are the total amount of cash inflows minus cash outflows. The payback period is the amount of time it takes for an investment to recoup its initial cost.

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Answer:

H2+CO2=H2O+CO

Kp=(pCO)(pH2O)/(pH2)(pCO2)

= 11×11/8.70×8.70

=1.60

Answer:

Transverse waves are known by motion being perpendicular to the waves movements. Longitudinal waves move in a direction parallel to the way the wave moves. Water waves are an example of both as they move in a clockwise motion.

Explanation:

( Sorry if it is not the best answer but I did my best by researching )

Answer:

1.  electrons

2. From "Y" to "X"

Explanation:

1. Electrons move between the rod since the electrons are the only charge carriers which are free to move.

2. The particles move from from "Y" to "X"  since the electrons are the only charge carriers which are free to move. The positive charge on rod x is due to a deficit of electrons while the negative charge on rod Y is due to the excess of electrons. When the rods come together, the electrons move from "Y" to "X" since the electrons are the only charge carriers which are free to move.

The chemical equation for the reaction of the monohydrogen phosphate ion (HPO₄²⁻) with water (H₂O) is: HPO₄²⁻ + H₂O → H₂PO₄⁻ + OH⁻

In this reaction, the monohydrogen phosphate ion reacts with water to form dihydrogen phosphate (H₂PO₄⁻) and hydroxide ion (OH⁻). The monohydrogen phosphate ion donates a proton (H⁺) to a water molecule, resulting in the formation of the dihydrogen phosphate ion.

Simultaneously, the water molecule accepts the proton, leading to the production of the hydroxide ion. This reaction can occur because the monohydrogen phosphate ion is amphoteric, meaning it can act as both an acid and a base.

The resulting products, dihydrogen phosphate and hydroxide ions, contribute to the pH and ionic balance in aqueous solutions.

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Answer:

true

Explanation:

Answer:

true

Explanation:

when the temperature of the gas is decreased or pressure on the gas is increased, the gas becomes liquid at a certain temperature or pressure.

Answer:

A - meiosis results in two genetically identical offspring cell

Explanation:

Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell.

Answer:

The answer is C

Explanation:

I took the test on AP3X

Answer:

49.6 mL

Explanation:

is the answer, I just did it :)

49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

We can also use the formula-

M1V1 = M2V2

M1 = 0.25

V2 = 400mL

M2 = 0.0310

V1 = ?

V1 = M2V2/ M1

V1 = 49.6mL

Therefore, 49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.

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The enthalpy change for the sublimation of iodine I₂(s) → I₂(g) is 62 kJ/mol.

The correct answer is E: 62 kJ/mol

The enthalpy change for the sublimation of iodine (I₂) is determined using Hess's Law which states that the total enthalpy change of a reaction is independent of the pathway taken.

Given the two equations:

½ H₂(g) + ½ I₂(s) → HI(g) ΔH = 26 kJ/mol  ---- (1)

½ H₂(g) + ½ I₂(g) → HI(g) ΔH = -5.0 kJ/mol ---- (2)

The equation of the sublimation of iodine is given below as follows:

I₂(s) → I₂(g)

Subtracting equation 2 from equation 1 to eliminate HI (g) gives the equation of the sublimation of iodine:

[½ H₂(g) + ½ I₂(s) → HI(g)] - [½ H₂(g) + ½ I₂(g) → HI(g)] = 26 kJ/mol - (-5.0 kJ/mol)

Simplifying:

½ I₂(s) → ½ I₂(g) ΔH = 31 kJ/mol

Multiplying the equation above by 2 gives the equation of the sublimation of iodine

I₂(s) → I₂(g) = 62 kJ/mol

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Answer:

Mass of truck = 29.62 kg (Approx.)

Explanation:

Given:

Kinetic energy = 1200 J

Speed of truck = 9 m/s

Find:

Mass

Computation:

The kinetic energy of a thing is the force that has attributable to its movement in physics.

Kinetic energy = [1/2][m][v]²

1,200 = [1/2][m][9]²

1,200 = [1/2][m][81]

Mass of truck = 29.62 kg (Approx.)

Answer:

The lymphatic system produces white blood cells, known as lymphocytes. There are two types of lymphocyte, T cells and B cells. They both travel through the lymphatic system. As they reach the lymph nodes, they are filtered and become activated by contact with viruses, bacteria, foreign particles, and so on in the lymph fluid.

Explanation:

The estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

Molar mass of water, M = 18g/molDensity of water, ρ = 1g/cm³ = 1000kg/m³The number of molecules per unit surface area of water can be estimated as follows:Number of water molecules per unit volume of water = Avogadro's number, NA / MNumber of water molecules per unit volume of water = 6.022 × 10²³ / 18 = 3.345 × 10²² / molThe number of molecules per unit surface area of water = the number of molecules per unit volume of water × the thickness of the water layer on the surface= 3.345 × 10²² / m³ × 1 × 10⁻⁸ m= 3.345 × 10¹⁴ / m²b)Given:Coordination number of water, CN = 4Binding energy of hydrogen bond, E = 10⁻²⁰ JThe surface tension of water, γ water = 0.072 N/mEnergy required to bring one molecule from the bulk of the liquid to the surface of the liquid, ΔE= γ water × AThe total binding energy of a water molecule in the liquid state = the binding energy of one hydrogen bond × the coordination number= 10⁻²⁰ J/bond × 4 bonds = 4 × 10⁻²⁰ JThe number of molecules per unit surface area of water = the energy required to bring one molecule from the bulk of the liquid to the surface of the liquid / the total binding energy of a water molecule in the liquid state= ΔE / 4 × 10⁻²⁰= 0.072 / (4 × 10⁻²⁰)= 1.8 × 10²⁰The surface tension of water can also be expressed as follows:γ water = (N / A) × EThe number of hydrogen bonds per unit area, N / A = γ water / E= 0.072 / 10⁻²⁰ = 7.2 × 10¹⁸ / m²The difference between the estimated value and the observed value is relatively large (about a factor of 25). It is because this is just an estimate, and it does not consider all the factors affecting the surface tension of water. However, the estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

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The required actual work output of the turbine is 1.2 Mj/kg.

If the isentropic efficiency of the turbine is 80%, calculate the actual work output of the turbine, in kj/kg.A steam turbine receives steam at a particular pressure and temperature and discharges it at a lower pressure and temperature. In general, the steam turbine's work output is less than the maximum possible work output, which is known as the isentropic turbine work output. The ratio of the actual turbine work output to the isentropic turbine work output is known as the isentropic turbine efficiency.ηt = Wtisentropic/WtactualWhere,ηt = isentropic turbine efficiencyWtisentropic = isentropic turbine work outputWtactual = actual turbine work outputGiven, isentropic efficiency of the turbine is 80%.ηt = 80% or ηt = 0.8We know thatWtactual = ηt x Wtisentropicor Wtisentropic = Wtactual/ ηtWe also know thath1 = 3.6 Mj/kgh2 = 2.1 Mj/kghence,Δh = h1 - h2 = 3.6 - 2.1 = 1.5 Mj/kgNow we have, Wtisentropic = Δh = 1.5 Mj/kgWtactual = ηt x Wtisentropic = 0.8 x 1.5= 1.2 Mj/kgTherefore, the actual work output of the turbine is 1.2 Mj/kg.

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